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Old 01-18-2017, 01:51 AM   #19
Drives: 2007 yaris 3 door
Join Date: Sep 2015
Location: Denver, Colorado
Posts: 964
this engine is not producing enough pressure to require anything larger than 2" diameter exhaust. i had a civic (130hp) with a 2.25 and shrunk it down to 2" and had noticeable gains.
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Old 02-21-2017, 07:21 PM   #20
Drives: Yaris HB
Join Date: Dec 2014
Location: GT (502)
Posts: 70
Originally Posted by NJP440 View Post
I was referred to go magnaflow I'm trying to keep an even 2.5" the full way back but I definitely need something a little quieter before I get pulled over

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Sorry, the muffler is Magnaflow 14805, double wall, 3.5" Tip Dia, 3.75 Tip Lenght, 2.25 Inlet Dia.

Originally Posted by tarkus View Post
Keep in mind that you can lose some low-end torque if you go too wide with the exhaust diameter.

I vote for the underdrive pulley. It will also be lighter weight :-)

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Some place to buy it online?

Originally Posted by tmontague View Post
If you're keeping your engine NA then don't go larger than 2.25".

I decided to take the advice of a reputable and very good exhaust shop against the advice of some of the experienced YW members and I lost noticable torque. Had the shop re make a 2.25" and most of the torque came back and still has the increased top end.

That was with all the flow mods -dc header, MI intake manifold, intake, 1zz TB.
Good to know it.
VELMAX member.
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